An image processing apparatus for controlling a display apparatus including a luminance modulation element and a color modulation element that are configured using different modulation elements, includes: a control value determination unit that determines, based on an input target color value, using a plurality of color conversion matrixes that describe a relationship between the target color value and a control value for the color modulation element for each control value for the luminance modulation element, the control value for the color modulation element; and a correction unit that non-linearly corrects the control value for the color modulation element according to a characteristic of the color modulation element.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An image processing apparatus for controlling a display apparatus comprising a luminance modulation device and a color modulation device that are configured using different modulation devices, the image processing apparatus comprising: a control value determination unit configured to determine a control value for the color modulation device, based on an input target color value, using a plurality of color conversion matrixes, prepared in advance and retained for each control value for the luminance modulation device, that describe a relationship between the target color value and the control value for the color modulation device; and a correction unit configured to non-linearly correct the control value for the color modulation device according to a characteristic of the color modulation device.
2. The image processing apparatus according to claim 1 , wherein the color conversion matrixes describe a relationship of the control value for the color modulation device with respect to a color value defined in a display-apparatus-independent color space.
3. The image processing apparatus according to claim 2 , wherein the display-apparatus-independent color space is an absolute XYZ color space.
4. The image processing apparatus according to claim 3 , further comprising a transformation unit that converts a target color value defined in a relative color space into a target color value defined in an absolute color space.
5. The image processing apparatus according to claim 1 , wherein the control value determination unit selects the control value for the luminance modulation device according to the input target color value and selects a color conversion matrix of the color conversion matrixes according to the selected control value for the luminance modulation device.
6. The image processing apparatus according to claim 5 , wherein the control value determination unit selects a plurality of color conversion matrixes corresponding to the plurality of control values for the luminance modulation device to determine a plurality of control values for the color modulation device, selects a plurality of color values that are expected to be obtained in the display-apparatus-independent color space based on the plurality of control values for the color modulation device, and determines one of the plurality of values as the control value for the luminance modulation device, and the control value for the color modulation devices based on a comparison between the plurality of color values and the input targeted color value.
7. The image processing apparatus according to claim 6 , wherein the control value determination unit determines a temporary control value for the luminance modulation device based on the input targeted color value, and selects the plurality of color conversion matrixes corresponding to control values for the luminance modulation device that fall within a predetermined range with respect to the temporary control value for the luminance modulation device.
8. The image processing apparatus according to claim 5 , wherein, upon determining the control value for the luminance modulation device is generated for each of a plurality of components included in the targeted color value, a plurality of control values for the luminance modulation device are determined using the table for the plurality of components, and determines a largest control value of the plurality of control values as the control value for the luminance modulation device.
9. The image processing apparatus according to claim 8 , wherein the table that describes the relationship with the control value for the luminance modulation device is made up of values that fall within a color reproduction range in a display-apparatus-independent color space.
10. The image processing apparatus according to claim 1 , wherein the control value determination unit determines a temporary control value for the luminance modulation element according to the input target color value, selects a color conversion matrix based on the determined temporary control value for the luminance modulation device, determines the control value for the color modulation devices from the input target color value and the selected color conversion matrix, and determines the control value for the luminance modulation device according to the input targeted color value and the determined control value for the color modulation device.
11. The image processing apparatus according to claim 10 , wherein, upon determining the control value for the luminance modulation device according to the input targeted color value and the determined control value for the color modulation device, the control value determination unit determines a color value that is expected to be obtained in the display-apparatus-independent color space based on the determined control value for the color modulation device, determines a plurality of color values that are expected to be obtained in the display-apparatus-independent color space obtained from the plurality of color conversion matrixes corresponding to the determined color value and a predetermined plurality of control values for the luminance modulation device, and determines the control value for the luminance modulation device based on a comparison with the input targeted color value.
12. The image processing apparatus according to claim 11 , wherein the control value determination unit uses the plurality of color conversion matrixes corresponding to control values for the luminance modulation device that fall within the predetermined range with respect to the temporary control value for the luminance modulation device.
13. A method for image processing for controlling a display apparatus comprising a luminance modulation device and a color modulation device that are configured using different modulation devices, the method comprising: determining a control value for the color modulation device, based on an input target color value, using a plurality of color conversion matrixes, prepared in advance and retained for each control value for the luminance modulation device, that describe a relationship between the target color value and the control value for the color modulation devices; non-linearly correcting the control value for the color modulation devices according to a characteristic of the color modulation device; and controlling the color modulation device based on the corrected control value for the color modulation device.
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September 12, 2005
July 14, 2009
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